Micro-resistance slow closing check valve

Abstract

The utility model relates to check valve technical field discloses a kind of micro-resistance slow-closing check valves, including valve body structure and slow-closing check subassembly installed on valve body structure, valve body structure includes valve shell, slow-closing check subassembly includes annular frame, sealing ring and gas pressure cylinder, annular frame is slidably provided with first slide by fixed frame, one end of first slide is fixedly installed with valve core, spring is sleeved on first slide, sealing ring, gas pressure cylinder are respectively fixedly installed on the inner wall of valve shell, gas pressure cylinder is connected with the inside of inlet pipe by connecting pipe and inlet pipe, control valve is installed on connecting pipe, the inside of gas pressure cylinder is slidably provided with second slide by piston, one end of second slide is fixedly installed with block, the limiting slot that is compatible with block is provided on valve core.The utility model slowly flows back to inlet pipe by connecting pipe, effectively slows down the reset speed of valve core, avoid the mechanical wear caused by the rapid impact of valve core to sealing ring, prolong the service life of valve core component.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, and in particular to a low-resistance slow-closing check valve. Background Technology

[0002] The low-resistance slow-closing check valve is a one-way control valve used in pipeline systems to prevent backflow of media. It is suitable for water supply and drainage, HVAC, chemical and industrial fluid transportation, and other fields. This valve relies on the pressure generated by the flow of the media to open the valve disc. When the flow direction is stable, the valve disc remains open. When the flow rate decreases or the media stops flowing, the valve disc, through its structural design, slowly closes, effectively preventing backflow when a backflow tendency occurs.

[0003] In existing technologies, after the medium stops being transported, the valve core will move rapidly toward the sealing part under the reset force and violently impact it. This will not only generate strong impact noise and vibration, but also lead to increased mechanical wear of the valve core and the sealing part, shortening the service life of the components. Frequent impacts may also cause a decrease in sealing performance and lead to medium leakage. Utility Model Content

[0004] Given that when the existing medium stops being transported, the valve core will move rapidly toward the sealing part under the reset force and violently impact it, which will not only generate strong impact noise and vibration, but also lead to increased mechanical wear of the valve core and the sealing part, shorten the service life of the components, and frequent impacts may also cause a decrease in sealing performance and cause medium leakage, this utility model is proposed.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a low-resistance slow-closing check valve, comprising a valve body structure and a slow-closing check assembly mounted on the valve body structure. The valve body structure includes a valve shell, and the slow-closing check assembly includes an annular frame, a sealing ring, and a pneumatic cylinder. A first slide rod is slidably mounted on the annular frame via a fixed frame. A valve core is fixedly mounted at one end of the first slide rod, and a spring is fitted on the first slide rod. The sealing ring and the pneumatic cylinder are respectively fixedly mounted on the inner wall of the valve shell. The pneumatic cylinder is internally connected to an inlet pipe via a connecting pipe, and a control valve is mounted on the connecting pipe. A second slide rod is slidably mounted inside the pneumatic cylinder via a piston. A stop block is fixedly mounted at one end of the second slide rod, and a limiting groove adapted to the stop block is provided on the valve core.

[0006] As a preferred embodiment of the micro-resistance slow-closing check valve of this utility model, an inlet pipe and an outlet pipe are fixedly installed at both ends of the valve body, respectively, and flanges are fixedly provided on the outer walls of the ends of the inlet pipe and the outlet pipe, and sealing rings are provided on the inner walls of the inlet pipe and the outlet pipe.

[0007] As a preferred embodiment of the micro-resistance slow-closing check valve of this utility model, the annular frame is fixedly installed on the inner wall of the valve body and on the side close to the outlet pipe, and the fixing frame is fixedly installed inside the annular frame.

[0008] In a preferred embodiment of the micro-resistance slow-closing check valve of this utility model, the first slide rod is slidably disposed in the fixed frame, one end of the spring is fixedly connected to the valve core, and the other end is fixedly connected to the fixed frame, and the valve core and the sealing ring cooperate with each other.

[0009] As a preferred embodiment of the micro-resistance slow-closing check valve of this utility model, one end of the pneumatic cylinder is inside the valve shell, and the other end is outside the valve shell, and the connecting pipe is fixedly connected to the end of the pneumatic cylinder outside the valve shell.

[0010] In a preferred embodiment of the micro-resistance slow-closing check valve of this utility model, the piston is slidably disposed inside the pneumatic cylinder, the second slide rod extends through the side wall of the pneumatic cylinder to the inside of the valve housing, and the second slide rod and the side wall of the pneumatic cylinder are slidably connected.

[0011] The beneficial effects of this utility model are: 1. By slowly returning the fluid to the inlet pipe through the connecting pipe, the reset speed of the valve core is effectively reduced, avoiding mechanical wear caused by the valve core rapidly impacting the sealing ring, thus extending the service life of the valve's core components. At the same time, the slow-closing function can avoid water hammer caused by reverse flow of the medium, reducing the impact and damage of water hammer pressure on the valve and pipeline, and improving the operational reliability of the entire pipeline system. 2. During the medium conduction stage, the medium pressure can be used to push the piston to drive the block to embed into the limiting groove of the valve core, providing additional thrust for the valve core to open, effectively reducing the opening resistance when the medium flows. The separation method between the valve core and the sealing ring is smooth, ensuring the stability of the pipeline system operation. Through the matching design of the flange and the sealing ring, a reliable fixed connection between the valve and the pipeline is achieved. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the valve body structure of this utility model; Figure 3 This is a cross-sectional view of the valve housing of this utility model; Figure 4 This is a schematic diagram of the valve core of this utility model; Figure 5 This is a cross-sectional schematic diagram of the pneumatic cylinder of this utility model.

[0013] Explanation of reference numerals in the attached figures: 1. Valve body structure; 11. Valve shell; 12. Inlet pipe; 13. Outlet pipe; 14. Flange; 15. Sealing ring; 2. Slow-closing check valve assembly; 201. Annular frame; 202. Fixing frame; 203. First slide rod; 204. Valve core; 205. Spring; 206. Sealing ring; 207. Pneumatic cylinder; 208. Connecting pipe; 209. Control valve; 210. Second slide rod; 211. Piston; 212. Abutment; 213. Limiting groove. Detailed Implementation

[0014] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0015] Example Refer to attached figure Figure 1 - Appendix Figure 5 This utility model provides a low-resistance slow-closing check valve, including a valve body structure 1 and a slow-closing check assembly 2. The slow-closing check assembly 2 is installed inside the valve body structure 1. The valve body structure 1 includes a valve shell 11. An inlet pipe 12 and an outlet pipe 13 are fixedly installed at both ends of the valve shell 11, respectively. A flange 14 is fixedly provided on the outer wall of the end of the inlet pipe 12 and the outlet pipe 13, and a sealing ring 15 is provided on the inner wall of the inlet pipe 12 and the outlet pipe 13.

[0016] The slow-closing check valve assembly 2 includes an annular frame 201, a sealing ring 206, and a pneumatic cylinder 207. The annular frame 201 is fixedly installed on the inner wall of the valve housing 11, near the outlet pipe 13. A fixing frame 202 is fixedly installed inside the annular frame 201. A first sliding rod 203 is slidably arranged inside the fixing frame 202. A valve core 204 is fixedly installed at one end of the first sliding rod 203, on the side away from the outlet pipe 13. A spring 205 is sleeved on the first sliding rod 203. One end of the spring 205 is fixedly connected to the valve core 204, and the other end is fixedly connected to the fixing frame 202. The sealing ring 206 is fixedly installed on the inner wall of the valve housing 11, near the inlet pipe 12. The valve core 204 extends into the sealing ring 206 to seal, thereby dividing the cavity of the valve housing 11 into two parts. The pneumatic cylinder 207... Two valves are provided and are fixedly installed on the side wall of the valve housing 11. One end of the pneumatic cylinder 207 is inside the valve housing 11, and the other end is outside the valve housing 11. A connecting pipe 208 is fixedly connected to the end of the pneumatic cylinder 207 outside the valve housing 11. The connecting pipe 208 passes through the inlet pipe 12 and extends into the inlet pipe 12. A control valve 209 is installed on the connecting pipe 208. A piston 211 is slidably provided inside the pneumatic cylinder 207. A second slide rod 210 is fixedly installed on the piston 211. The second slide rod 210 passes through the side wall of the pneumatic cylinder 207 and extends into the inside of the valve housing 11. The second slide rod 210 and the side wall of the pneumatic cylinder 207 are slidably connected. A stop block 212 is fixedly installed at the end of the second slide rod 210 away from the piston 211. A limiting groove 213 adapted to the stop block 212 is provided on the valve core 204.

[0017] During use, flange 14 is used for the fixed connection between the valve and the pipeline, and sealing ring 15 ensures the sealing of the connection. The medium enters the valve body 11 from the inlet pipe 12, opens the control valve 209, and the medium enters the pneumatic cylinder 207 through the connecting pipe 208, thereby pushing piston 211 to slide. Piston 211 drives second slide rod 210 to push block 212 into the limiting groove 213 of valve core 204, providing a thrust to valve core 204. At the same time, under the action of medium pressure, valve core 204 is pushed towards the outlet pipe 13. Valve core 204 drives first slide rod 203 to slide along the fixed frame 202 and compress spring 205. At the same time, valve core 204 separates from sealing ring 206. The internal cavity of the valve body 11 is interconnected. The medium flows through the gap between the valve core 204 and the sealing ring 206 to the outlet pipe 13 to achieve conduction. When the medium stops being transported, the pressure in the inlet pipe 12 decreases, and the spring 205 releases its elastic potential energy to push the valve core 204 to reset. When the valve core 204 resets, it pushes the stop block 212 to move. However, there is medium in the pneumatic cylinder 207. Under the push of the piston 211, the medium flows back to the inlet pipe 12 through the connecting pipe 208, thereby forming a buffer resistance on the reset movement of the valve core 204 and preventing the valve core 204 from rapidly impacting the sealing ring 206. Finally, the valve core 204 slowly extends into the sealing ring 206 to complete the seal, realizing the check valve and slow closing function, and finally closing the control valve 209.

[0018] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A low-resistance slow-closing check valve, comprising a valve body structure (1) and a slow-closing check assembly (2) mounted on the valve body structure (1), characterized in that: The valve body structure (1) includes a valve shell (11), and the slow-closing check valve assembly (2) includes an annular frame (201), a sealing ring (206), and a pneumatic cylinder (207). The annular frame (201) is slidably provided with a first slide rod (203) via a fixed frame (202). A valve core (204) is fixedly installed at one end of the first slide rod (203), and a spring (205) is sleeved on the first slide rod (203). The sealing ring (206) and the pneumatic cylinder (207) are respectively fixedly installed. On the inner wall of the valve housing (11), the pneumatic cylinder (207) is connected to the inside of the liquid inlet pipe (12) through the connecting pipe (208). A control valve (209) is installed on the connecting pipe (208). A second slide rod (210) is slidably arranged inside the pneumatic cylinder (207) through the piston (211). A stop block (212) is fixedly installed at one end of the second slide rod (210). A limiting groove (213) that matches the stop block (212) is provided on the valve core (204).

2. The low-resistance slow-closing check valve according to claim 1, characterized in that: The valve body (11) is fixedly installed with an inlet pipe (12) and an outlet pipe (13) at both ends. Flanges (14) are fixedly provided on the outer walls of the ends of the inlet pipe (12) and the outlet pipe (13). Sealing rings (15) are provided on the inner walls of the inlet pipe (12) and the outlet pipe (13).

3. The low-resistance slow-closing check valve according to claim 2, characterized in that: The annular frame (201) is fixedly installed on the inner wall of the valve housing (11) and on the side close to the outlet pipe (13), and the fixing frame (202) is fixedly installed inside the annular frame (201).

4. The low-resistance slow-closing check valve according to claim 3, characterized in that: The first slide rod (203) is slidably disposed in the fixed frame (202). One end of the spring (205) is fixedly connected to the valve core (204), and the other end is fixedly connected to the fixed frame (202). The valve core (204) and the sealing ring (206) cooperate with each other.

5. The low-resistance slow-closing check valve according to claim 1, characterized in that: One end of the pneumatic cylinder (207) is inside the valve housing (11), and the other end is outside the valve housing (11). The connecting pipe (208) is fixedly connected to the end of the pneumatic cylinder (207) outside the valve housing (11).

6. The low-resistance slow-closing check valve according to claim 5, characterized in that: The piston (211) is slidably disposed inside the pneumatic cylinder (207), and the second slide rod (210) extends through the side wall of the pneumatic cylinder (207) into the interior of the valve housing (11), and the second slide rod (210) is slidably connected to the side wall of the pneumatic cylinder (207).

Images